mirror of https://github.com/merbanan/rtl_433.git
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
// compat_time addresses following compatibility issue:
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// topic: high-resolution timestamps
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// issue: <sys/time.h> is not available on Windows systems
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// solution: provide a compatible version for Windows systems
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#include "compat_time.h"
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#ifdef _WIN32
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#include <stdbool.h>
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#include <stddef.h>
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#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
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#else
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
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#endif
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int gettimeofday(struct timeval *tv, void *tz)
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{
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if (tz)
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return -1; // we don't support TZ
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FILETIME ft;
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unsigned __int64 t64;
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GetSystemTimeAsFileTime(&ft);
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t64 = (((unsigned __int64)ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
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t64 /= 10; // convert to microseconds
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t64 -= DELTA_EPOCH_IN_MICROSECS; // convert file time to unix epoch
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tv->tv_sec = (long)(t64 / 1000000UL);
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tv->tv_usec = (long)(t64 % 1000000UL);
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return 0;
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}
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#endif // _WIN32
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int timeval_subtract(struct timeval *result, struct timeval const *x, struct timeval const *y)
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{
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// Copy one input
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struct timeval yy = *y;
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// Perform the carry for the later subtraction by updating y
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if (x->tv_usec < yy.tv_usec) {
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int nsec = (yy.tv_usec - x->tv_usec) / 1000000 + 1;
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yy.tv_usec -= 1000000 * nsec;
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yy.tv_sec += nsec;
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}
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if (x->tv_usec - yy.tv_usec > 1000000) {
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int nsec = (x->tv_usec - yy.tv_usec) / 1000000;
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yy.tv_usec += 1000000 * nsec;
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yy.tv_sec -= nsec;
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}
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// Compute the time difference, tv_usec is certainly positive
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result->tv_sec = x->tv_sec - yy.tv_sec;
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result->tv_usec = x->tv_usec - yy.tv_usec;
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// Return 1 if result is negative
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return x->tv_sec < yy.tv_sec;
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}
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